Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income		$ 61,247	$ 53,097
Other comprehensive income (loss), net of tax
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax		17,068	(62,556)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		10,163	(17,950)
Net change in other comprehensive income for defined benefit postretirement plans	[1]	(92)	121
Total other comprehensive income (loss)		27,139	(80,385)
Total comprehensive income (loss)		$ 88,386	$ (27,288)

[1] The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in Note 13 - Employee Benefit Plans within the Notes to the Consolidated Financial Statements included in Item 8 of the Company's 2022 Form 10-K.